Coding⏱️ 3 min read📅 2026-06-03

How to Fix: How to check if variable is string with python 2 and 3 compatibility

Check if variable is string in python 2 and 3 compatibility

Quick Answer: Use isinstance(x, basestr) for python 2.x, but note that this will not work as expected in python 3.x due to the removal of the 'u' prefix.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🛠️ Step-by-Step Verified Fixes
  3. 💡 Conclusion

Checking if a variable is a string can be tricky in Python 2 and 3 due to differences in encoding. In Python 2, strings are encoded using the system's default encoding, whereas in Python 3, strings are always Unicode by default.

This guide will walk you through how to check if a variable is a string in both Python 2 and 3.

💡 Why You Are Getting This Error

  • The issue arises from the fact that Python 2 uses the `basestr` type for string literals, whereas Python 3 uses the `str` type. This means that in Python 2, you need to use `isinstance(x, basestr)` to check if a variable is a string.
  • In contrast, Python 3 does not have a separate `basestr` type and uses the `str` type for all strings.

🛠️ Step-by-Step Verified Fixes

Using `isinstance(x, basestr)` in Python 2

  1. Step 1: To check if a variable is a string in Python 2, use the `isinstance()` function with the `basestr` type as the second argument.
  2. Step 2: For example: `if isinstance(x, basestr): print('x is a string')`
  3. Step 3: This method will work for both Unicode and non-Unicode strings.

Using `str` type in Python 3

  1. Step 1: In Python 3, you can simply use the `isinstance()` function with the `str` type as the second argument.
  2. Step 2: For example: `if isinstance(x, str): print('x is a string')`
  3. Step 3: This method will work for all strings, regardless of their encoding.

💡 Conclusion

In summary, to check if a variable is a string in both Python 2 and 3, use the following methods: in Python 2, use `isinstance(x, basestr)`, and in Python 3, use `isinstance(x, str)`. By following these steps, you can ensure that your code works correctly for all versions of Python.

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